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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'de3531579d2ff8edeb4e84053008c9989b872370b68e97b26cf55dda32a33ba7' 
  AND token = '4fbIPs9+b7tYf4gBJ384byHiZWozOZoGscJnFyiwpeQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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