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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '096d81853d7f642c8139ad48d9232c7c586ab060cb2fed34036502338b8a5675' 
  AND token = '3oGKJQcW6kgM6qNllv4gGv9V5U+Cp0HvL6OTxkSsqv8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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