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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '26765db3931d63792a2edf1e4e40dba0715ee8bd6ee74ab4f006fb27b621db22' 
  AND token = '3IEPc5mhqb8dkVlltjQOU/DO6nnj1S5zBZfTQKbTqwk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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