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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a4cfc9b023b36a8d9e4ba0148b379c3fb671860dfa6337d9b22a0c2563097d66' 
  AND token = '9Khv6ADcGwvlzslT1b4n65ZGOqc66XNZaMf0K3vzkIg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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