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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f07c40f7faec469694f4ba5a1069543f036c75e82ce1daf6f7c963c35de1b75' 
  AND token = 'SYJxIfirGtL+vhmnobaVRwcNwA0EvHBnc8mf70V6Ze0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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