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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '167d583b03c399cacfcf73cd3121c9eda5ecfc98ef4f691848a0863fb03f1eb5' 
  AND token = 'eHO4NhKq0KCtRMwNQ2TqCKAKvcoL0LAF0TLI3HF3Hq0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00011

JSON explain

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