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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b14cae6b89029d7b8b3171b8f2bd9b26fb6a3c3b5f0d7d63758bf67ce5be1d8b' 
  AND token = 'rydQHolhZx9WDHUu+T4NJZFcu5BBL96kNbbyCS/aKp4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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