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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '196f0393be2487d4fec7b91722b12fd9055c0acd255c50da9a1477f0ba0b98a5' 
  AND token = 'H06li2525TT9OsPeaH0EPh7qOwtOmyHVnMdd3NgksQQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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