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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b1ce665423e9209193b38f48e4e709e952235c5061c81d40d0b8abba5de497ec' 
  AND token = 'n82231Vz1gw0Z66AKGAz3vaw3Ui79ROl/KcPweNU8XY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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