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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e539cd17eb17ac8880a9b3fa296ddab6bf131df467de80f2df6ca7914fc2b7a' 
  AND token = 'PZQQvla/816i8EwIz5tipsvLHo6IgaA/cbkYaPtU/Sk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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