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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd119d303396517cbeb26a0ad08e2d3f3f8fb9ea223fa2459cc0fb7ce88632ad' 
  AND token = 'rnfN4AN2SYLn6JxmCOl/AGJ9HScDRvNf41WnKBl5PIE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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