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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98d992d12c49d63c42abb0ad8fd397ee226602831550390fc8eb3edcd1bddf2e' 
  AND token = 'ABZbjylQW35q7TnvI/sbsr/FiDeZu4s26/8nZzoLVEA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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