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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5d27e4d8c6e8ddb392d464782b61122472ba795d2e3916505bbb9f82506bf108' 
  AND token = 'apLeA4pOU2xbuwY2fVYlh3elaioAxb7ZVCy7N5yl7k8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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