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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac7d6de7c0f3b42d0b8a500d173e096fb5b3efcc30638eb5d2f2c209758ee7c9' 
  AND token = 'NsJ85uupMokpAiXceSbcATTuG1E1VoWndQp9GvwSggU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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