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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd4847f4d67bcc4133e60e16984010a9fdbe6d2e2ed11db8c68e15f29d39513c' 
  AND token = 'TkakSLuUwoxSvYDa65Stoyry9ZkFPLnEgJltOykGuRQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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