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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8e34b755c3cdcf0c30d45ada25e72c075a8781dcaaad7e8c1e79f78be5b13dc9' 
  AND token = 'ogsWK0lbdKnCJB9Ya3Lg3p0lPCg2Ln4HOscs+XgS3bc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00066

JSON explain

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