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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a8d7de80970d8970759c9751474009ebbfc42d2a067654c217c72792434472af' 
  AND token = 'PoKwXojqTpM6n0PrsZBaKx+19ADqmPku9AWUzl1i1c8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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