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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d2756a40a5475454ebc7e4532fa67396ec042aaff4900a30c030b4bb0e1a910' 
  AND token = 'ZucyeDYLlTSnMTpAXFKmDaCWQYWErgq8G76D0fPKVoY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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