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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf7564a17f2ca1e5f1c4562f070b79104f4ba46f9819c101a92f1d4685c4f92e' 
  AND token = 'gdl8Aa8DMPkYBFCbGai64/8vRPjezwIgAf+5hK4Pydk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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