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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd32a9e4c72e0d3c775fe3518fe7565d06e84fd3bc8a2ccde8a253094b3fb4fcc' 
  AND token = 'zE0DfasH8sOt7xefogTLRt0yCgPu2Kiogemcw3LR6+E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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