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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '82170f02e5f89d31e69f1ca00872a9a25e28629174b8ee648c7c6b413a63c478' 
  AND token = 'c/FzQAMdI2j5DHO2Mm8iBWVsqIsIipbsIrdMNpa2UJE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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