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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0867dd35cb61871e9029063cf0cb11d39ae7afebb27d260fc92ea375e7971179' 
  AND token = 'nDn8LfAzAG93x1c4yR8jcp1wlX9TLhROfXwIOZjQQkw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}