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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84705cb590da60cfe8de3048d280068cb385264d4dddc7ecc0fa9b2ecc77bacf' 
  AND token = 'PGfNntnNM+TN3EMcCNq4r9CoS0D34LAV/GVbF2BJ5bo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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