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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '14af7819d1d1252b60916c1cf43d281fd2fc2550afe8eb57efa46f60cce5f828' 
  AND token = 'J8Oi+MMghHv104X+ftNc4g8EVaOQLQmPk+iXmm30H3g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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