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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1a795469299502c1612730620a0a4a75178f32ff6a7582fea2267035a5e02049' 
  AND token = '99R9KL4W3QeegrymY5RwOdLhVeENNxdU8dQEWDOW0WI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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