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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7bc0507f29da6888bbbe5bd8067e4b9f5b3df7c930c56bc27d863541454c4a0a' 
  AND token = '11I7FpZbX8kYmnizRT667coHqiUri83GfOt/e7+CIWE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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