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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd744987a620426d90ae98c73d602b2ac4931c5c2197c84aac01a24121f8cd96b' 
  AND token = '6Z6D2WQIM0eqtMBNJLesC4weOL2Ma7i2wU54HhIWHBQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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