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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '784165a264aa8e4722ed76ac0eb1d68c4ed9384a78cf1c7b46c65f93bf61c771' 
  AND token = 'h+UR1lcTO/rk8mDyT0nX87rCW95th26WS0oJyGefwqg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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