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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0769f90126d998b15a7fd32131828daac5296cff41e720b3ab293e689641c090' 
  AND token = '0cJ7yJAL6kckcjYrFj+R/KJ+fz4W1AvSfD9T3GXHRC0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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