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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '31326f99e37432f751bc60806f4e32c1d408b9b93a27362b2bd044ae50ea8bb0' 
  AND token = 'CV+9dOLVscH1SzClbjKWB980a7bN4nxbRZfDkxZaNeY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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