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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3f87ea8de5f7f556192d824de39d927908d9f91e7881d1e360fee096c17c7c6c' 
  AND token = '1yGw/fOmNztS5JcRHVTopjlkdHO3uSb+52xnj9GOg/Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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