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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5c6b397552b1fc6883ce033597a0b17d7061dc47dfe1e6f6dffebbaf6ee80296' 
  AND token = 'RikJtOoH+1wywM7OJ1xFaswX3UvTq6VyZ6zcAkjF/kw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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