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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '54db0caeaead3eb85e9e08fd195e007e116c0105ba2af39f3f7de94c8186c757' 
  AND token = '3PtXdygsnTk56l2jGAXNCC5Oxk5H7jUM+Zbtxh0dNOU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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