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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd2fd386e84f95f6f7f514e32e5db3bedc4d3c40eb69e7357023354da065e1697' 
  AND token = '1fy+fOuX4uvq9NPoP0uV69WyeYqDN3tw+guHe+TEgOs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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