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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b991ec33facea0f11569ac513f50e6613421b5b3c0fe31c4b87565915b3be17c' 
  AND token = 'jMxLOwedfaQg3SE4PWcbsjY3HebPGHeDYSnM6lxuSvA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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