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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c0d0dd938bf2aaed354af4c4c025e3843a1ccde6e5867e725e261edbef5442d' 
  AND token = 'q5oirSxToKuJjX8DzD1Q2fbE0ksOYO+EvTslcu5V2+o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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