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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f9f3defc893fb8a097facc5b3a30cebb4630aa652badae95c4a46ac6dae89b4f' 
  AND token = 'Khf8CILTFHF3t1hpH97Y5i5HYGknnCuranhZpbzwgAY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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