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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a2b8d2e90ffb96216f625fec5529964702e4686b19396541a26bd4e70f6d3a44' 
  AND token = 'Q1LXtKm4C8E8xZddeNxByS37IsXTlu/i+8EHDgHDBUE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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