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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b64759b5ec5d6ab3597ab12c13769c9866321a5f972f72ba7833a3f62c9c87d7' 
  AND token = 'J6XleFijPFtRS/8WNWUdXUKoNckHqJHWqfqf07kUWG4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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