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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f3c56e4f15bdb0ec86726b32b7bcf85a70c76678bc431c2604e27ea504112815' 
  AND token = 'pkqSBizYO5NC2SZ1zaibJ+AR53fy+yPJgTD1LccCPKE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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