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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2bcedce1932f0b71de0ca99d85ed89be6eb2159320f2769ff5b1929e33fb7417' 
  AND token = 'fZh2l1DN2K01nRLHPmG7/w3/BmuWzPT8D5wKVtm1YJI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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