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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b586e48a59f35c0d3842869c455c34b1480ff4b9878d6523b22be4ff8367b5d4' 
  AND token = 'BomSNoE4prlurg1h2Xj856HUkaam1VJzU6OgasP7+3w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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