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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '47155cca652c736016fe9fe1cc73796ed18eb4b1a0e9052e871bfa20fe033305' 
  AND token = '4eQkMc/us7f2lvPipXAhh7HMPzwq/bKx8w5jKPeGZd8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00084

JSON explain

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