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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '911d20842a16cf9a4c1c6e634f566396ae59665b131be057c05cf203dd027cd7' 
  AND token = 'gyrf2vjV6g/IwcnF7Ashw8QFtz+ABnEsee8LxiLJcfw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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