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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e1877d80de56e67b82043caea5733f0b7c429bac243d0a0f2c19835bc9123c20' 
  AND token = 'pDBJ4OB6ubsG32gs1ERvRxaJKb2b/Ah3VYRnJX1hBpY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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