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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f5b39bcbfb3e330a6b22e491fd5ab7e9996359bf573c2e1b97f763a0e9d70ee' 
  AND token = 'vJ8hMyXMt5SK+vCxOJtAL33KHWRm3OXLyhQ2rAHP3kI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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