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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b2c4d2a5ac7f772b729568dc0a2d98d716f1e235bcdccaa424f75bcd80098c36' 
  AND token = 'N1eLVXRU8H4tGxMu5LS54Zn8ulqFJKg0k7UTx7ij4sI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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