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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc69e12fc0bab6dfac29be85b6a5ece53449a7d9a62af8f1994630e93114973c' 
  AND token = 'Onap74ZEEQQFGCAq0yow6R/11mezcnYYv1lVQ39BGik=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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