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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b3effeb97fd78f74cac1c72136e3b0303859967ad7f6c6d1686fa4b3c394a76b' 
  AND token = 'giJFwuloEtyi9R12nGDLrIQ9zv73byQLqYpbJURUfOs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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