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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e2f689d28aca0de9cc92a291718347151214d25cbf177cb582d7889f12019822' 
  AND token = 'aR7v6LSry2mlLkCTaMaia8njEkXYD7mgUNMGGnI2/EA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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