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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5958315d99106fce03d67f2fa39feb8082ab8793b3efa32ec79aceb1e12ab609' 
  AND token = 'FZNl0XjWvPTBbyI/20SMnak/eOGe/Sz5d6NW8qu62dM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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