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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '69fbbfcb205e544df60befc95a57c840ea81fd2c1dbbf698350c770e4a86fdd6' 
  AND token = 'zkHvvySKuDXXTfTjUAoxWWF9k0huwVQotuq6dr4I8/8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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