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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '52b85b55bb4d8fbcc09dd562bc96bccb8a7a63ae8ab11250ef8312c58f18d910' 
  AND token = 'n7W0idmdyjhvCMTI+PEjWVBymtErOOuXWQeU+slFhHM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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