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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b2558d066894d02f7ee87b8c19ee4e7968a897fe4e724352e09bb87b73f1b8dd' 
  AND token = 'bm/YKEFuzLKyvUsCyKoecXf890HgX35VCacDcrCsKiM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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