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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6befdeb533a78b8ee3dc7da3d0379b7a2d50b37868b4cfc13a0bd18e5a36cac3' 
  AND token = 'eOfT2IKgJgovhVCsAqT85fDZg3XUKDkQSGS5TfVQ07M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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