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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68bd3eaa812019b3d72f2227f0e3c875ecbd8ba4405e7e5bd77bf62a6199bec7' 
  AND token = 'Op92q+yLFtVgzb+xoyGK6lFR8IwvLxfIwMiH6vO3rOQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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