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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7150f11b362b187cf5ba5cd6efa9b951f045e3c336d4f524479fa3da4550cf5c' 
  AND token = 'VGpIB4ejOskPobnubGKJPt7EzkVSIH9RjV2mRXiuK5E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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